William e



(No Model.) 7

- W. R. PATTERSON.

ELECTRIC DOOR REGISTER FOR WATGHMEN.

No. 504,741. Patented Sept. 12 1893.

UNITED STATES PATENT OFFICE.-

IVILLIAM R. PATTERSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WEST- ERNELECTRIC COMPANY, OF SAME PLACE;

ELECTRIC DOOR-REGISTER FOR WATCHMEN.

SPECIFICATION forming part of Letters Patent'No. 504,741, datedSeptember 12, 1893. Application filed January 31 1889. Serial No-298,227. (No model.)

To all whom it may concern.-

Iie it known that I, WILLIAM R. PATTERSON, a citizen of the UnitedStates, residing at Chicago,1n the county of Cook and State of Illi-1101s, have invented a certain new and useful Improvement in ElectricDoor-Registers for WVatchmen, (Case No. '78,) of which the following isa full, clear, concise, and exact description, reference being had tothe accomro panying drawing, forming a part of this specification.

The object of my invention is to provide means for indicating whetherdoors, as fire doors, have been opened, and if so, for mak- I 5 ing arecord of the time during which each door mayhave remained open. In thismanner the movements of the watchman about a building may be recordedand in case he should negligently leave a door open at any time duringhis rounds the fact of such negligence will be indicated. In case heshould neglect any part of his route which requires the opening of adoor, such negligence would also be indicated by the absence of theusual 2 5 record made by opening and closing the particular door.

The usual watchmans detector now in use in factories consists ofcircuits, with keys distrlbuted at different points throughout thebuilding so arranged that upon operating the keys in succession a recordwill be made upon a register sheet moved by clock work. In

this form of apparatus, for reasons well understood, it is necessarythat some little time 3 5 shall elapse in passing from one key orstation to the next. This system is therefore defective in that twostations cannot be placed close to one another.

The operation of my watchmans detector system is such that the record ismade automatically and isnot dependent upon any particular sequence inthe opening and closing of the doors. It, however, records the time ineach instance and the sequence will therefore be indicated. Thus it willbe seen that the route of the watchman as he goes his rounds will thusbe delineated upon the chronogragh sheet in all cases. The authorizedopenings of the doors as well as the unauthorized are thus recorded.

My invention briefly stated consists in circuits extending from thedifierent doors to different chronograph pens so arranged that when thedoor is open the position of the pen corresponding to the particulardoor, will be moved from its normal position upon the chronograph sheet.

As illustrative of my invention I have shown a diagram in which two setsof double doors are connected by different circuits with a chronograph.

It will be understood that the chronograph cylinder at is provided withthe usual clock work mechanism for driving the same at any desireduniform rate of speed. The length of the cylinder should be sufficientto afford room for as many pens as there are sets of doors. In practicethe space required for one pen would be from ahalf an inch to an inch.The circumference of the cylinder should be sufficient to afford roomfor making the reo- 0rd for the desired number of hours, for example, aroller thirty-six inches in circumference would allow a record fortwelve hours at therate of three inches per hour or a quar- 7 5 ter ofan inch for each five minutes so that a sheet of paper thirty six incheslong by twenty inches wide would hold the record of from twenty to fortydoors for a time of twelve hours. It is evident, however, that the rateof speed and the size of the roller may be varied according to theservice required. As a matter of convenience one pen of the chronographmay be connected with a clock arranged to close the circuit successivelyat predetermined intervals. I have shown the pendulum 1) arranged toclose the'circuit of battery 0 through the electro magnet 61 of pen 6 ateach oscillation of the pendulum. For this purpose a cup of mercury isplaced in the usual manner below the pendulum bob. If the paper is to bemoved however, only at the rate of three inches an hour I should arrangethe clock mechanism to close the circuit only once in five minutes in awell known way.

The pen f is shown connected with a circuit g extending to four doors h71 h 7L one side of this circuit is connected with the box a; and theother side with the movable contacts 7c k 70 In, these contacts beingheld open Ioo respectively by the doors when closed. On opening eitherdoor the particular contact of that door is moved by a retractile springor otherwise to close the circuit of the battery included in circuit g.The pen fisthus moved from its normal position as indicated and thus arecord is made of the particular time during which the door h orwhatever the door may be is left open. The pen Z is connected in asimilar manner by circuit on with contacts a n and contact 0 contacts orn are held separated from contact 0 when the doors p p are closed. Onopening either of these doors p p the circuit m will be closed throughpen l in the manner heretofore described with respect to circuit g.Suppose the records 6, 7, 8, 9, 10, ll, 12, 1, 2, 3, to indicate thecorresponding hours, it would then appear that one of the doors ofcircuit g was opened at about eight oclock and was still open at threeoclock and that one of the doors of circuit m was opened at about nineoclock and closed at about eleven.

I have shown a metallic circuit between each pen and its correspondingdoor or doors. It is evident that grounded circuits might be used orthat a common return wire might be employed in the manner wellunderstood.

It is evident that my invention admits of Various other modificationsthat would readily suggest themselves to those skilled in the art and Itherefore do not limit myself to the details of construction shown.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. The combinationwith a driven chronograph sheet, of a periodically actuatedelectro-magnetic pen resting thereon and adapted to make indicationsthereon, of a second electro-magnetic pen resting thereon, the coilthereof extending to contacts operated by a door on opening and closingthe same, to hold the contact closed when the door is open and to holdthe contact open when the door is closed continuously; whereby thecircuit is closed to move the position of the pen to register the timeduring which the door is left open, substantially as and for the purposespecified.

2. The combination with a driven chronograph sheet, of a periodicallyactuated electro-magnetic pen resting thereon and adapted to makeindications thereon, electromagnetic pens resting thereon, each of saidlatter pens beingconnected in a circuit extending to contact points ofdifferentdoors, each door, when closed, holding its contact continuouslyopen; whereby the position of said doors as open or shut and the time ofchange from one position to the other are registered, substantially asdescribed.

In witnesswhereof I hereunto subscribe my name this 22d day of January,A. D. 1889.

IVILLIAM R. PATTERSON.

Witnesses:

ELLA EDLER, GEORGE P. BARTON.

